NEGATIVE ACTIVE MATERIAL FOR RECHARGEABLE LITHIUM ION BATTERY AND MANUFACTURING METHOD FOR SAME, AND RECHARGEABLE LITHIUM ION BATTERY AND MANUFACTURING METHOD FOR SAME

摘要

The purpose of the present invention is to provide a negative active material for a rechargeable lithium ion battery that can impart high capacity and high-speed charge and discharge to the rechargeable lithium ion battery. In this manufacturing method, a mixed material containing a mixture of anatase-type TiO2 and fluoric acid is heated at 70°C or more to yield titanium oxide fluoride (heating process). This mixed material contains over 2 mol of hydrogen fluoride (HF) per mol of the anatase-type TiO2. If the titanium oxide fluoride obtained by this manufacturing method is used as a negative active material for a rechargeable lithium ion battery, a rechargeable lithium ion battery for which high capacity and boost charge are possible will be obtained.